The Bell 206 is a family of two-bladed, single- and twin-engine helicopters, manufactured by Bell Helicopter at its Mirabel, Quebec plant. Originally developed as the Bell YOH-4 for the United States Army's Light Observation Helicopter program, it was not selected by the Army. Bell redesigned the air-frame and successfully marketed the aircraft commercially as the five-place Bell 206A Jet Ranger.

The new design was eventually selected by the Army as the OH-58 Kiowa. Bell also developed a seven-place Long Ranger, which was later offered with a twin-engine option as the Twin Ranger, while Tridair Helicopters offers a similar conversion of the Long Ranger called the Gemini ST. The ICAO-assigned model designation "B06" is used on flight plans for the Jet Ranger and Long Ranger, and the designation "B06T" is used for the twin-engine Twin Rangers.